Troubleshooting
Compressor starts but shuts
down sometime later.
Water high-temperature
switch is open.
Check the coolant flow and
temperature. Refer to the
Specifications.
Circuit breaker or fuse is
open.
Reset the circuit breaker or
replace a fuse. Compare the
electric service with system
specifications. Consult a SCAI
Service Center if the problem
persists.
Component failure in the
power circuit.
Check for an open circuit
breaker or fuse. Reset or
replace if necessary. Check for
a faulty component.
Incorrect current draw. Measure the current. Check
motor winding resistances.
If checks reveal failed motor
windings or a locked rotor,
consult a SCAI Service Center.
Compressor overload relay
opens.
If power check indicates the
utilities are within specifications,
interlocks may be faulty.
Consult a SCAI Service Center.
Fan or circulator runs slow or
is stopped.
See below at “Fan runs slow or
has stopped” or “Coolant flow
has stopped”.
Coolant loss is greater than
(1) liter.
Consult a SCAI Service Center.
System starts but gas
pressures are abnormally
high or low.
Wrong equalization pressure. Refer to Specifications and the
section on Charging and
Venting. Leak check the system
if the pressure is low.
Gas line couplings are not
fully engaged.
Be sure that all Aeroquip
couplings are fully engaged and
torqued.
Gas lines are connected
wrong.
Reconnect. See the Installation
section.
Compressor runs, but cold
head valve motor operation is
abnormal
Wrong cold head cable. Be sure correct cold head cable
is connected (Page 56.)
Cold head problem. Consult cold head manual.
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